Tone-purifier for talking-machines.



APPLICATION FILED NPR. 24, I916- Patented Jan. 30, 1917.

[1V VEN TOR. (69791 if I? 1 14591411 WITNESS ATTORNEY CHARLES P. MARSHALL, F WATERTOWN, NEW YORK.

TONE-PUBIFI ER FOR TALKING- MACI-IINES.

Specification of Letters Patent.

Patented Jan. 3d, 191% Application filed Ap1'i124, 1916. Serial No. 93,038.

To all whom it may concern:

Be it known that '1. (becomes P. MAR snALL, a citizen of the United States, residing at Watertown, in the county of J efi'erson and State of New York, have invented certain new and useful Improvements in Tone-Purifiers for Talking-Machines, of which the following is a specification.

This invention relates to means for puritying the tones of phonographs, talkingmachines, and like musical instruments, and the intentionrelates particularlytoa tone modifieror purifier comprising a damping de vice for attachment to the vibration-bars which Vibrate the reproducing 'diaphragms of such instruments.

The prime object of the invention is to improve'the quality of the tones of the instruments and render them clearer, truer,

purer, and more natural than heretofore.

The particular object of the invention is to improve the means shown and described in my pending I application, Serial N 0. 22m, and April 20, 1915.

I attain these objects by the means set forth in the detailed description which follows, and by reference to the accompanying drawing, in whichdiaphragm 3.

. Figure 1 is an elevational view of the reproducing parts of a talking machine; showing my tone purifier applied thereto. Fig. 2 is an enlarged side elevation, with parts broken away, of the transmitter; showing the tone purifier mounted on the vibration- Fig. 3 is an open face view of the transmitter. Fig. 4 is an enlarged view of the damping part. Fig. 5 is a view of the damping part before it is applied to the vibration-bar. Fig. 6 is a perspective view of the damping part; showing the slots for receiving the vibration-bar.

the drawing, 2 represents the hollow case of the reproducer or'transmitter of a talking machine, in which is disposed the The reproducer is mounted upon the .nsual hollow sound-arm 55', which is supported by'the box or cabinet 6.

? represents revolving support for the record disk 8, which is mounted on. the top the cabinet in the usual manner.,

lily tone modifier or purifier relates particularly to an attachment to be applied to odncers of talking machines of vands, or ma also be applied to the parts oisuch instruments, and

comprises a member or part A, for subduing the discordant noise of the fundamental note of the vibration-bar, as well as the diaphragm. The noises referred to, it may be explained, are not parts of the music transmitted from the record, but are harsh, grating notes or sounds which are given 0E by the vibration-bar and diaphragm, when these parts are vibrated by the contact of the needle with the revolving record disk.

The member A consists of a piece of rubber or other suitable material, preferably soft and flexible, like the material of an eraser or rubber band, which is preferably forked, as shown in- Figs. 2, 5' and 6. lhe free ends of the legs aare slotted, as at 9 and 9, to receive or straddle the vibration bar 10, or preferably that portion of said bar which extends between the elbow 11 and a shoulder 12 of the support 13 which holds the needle 14. Fig. 5 shows the forked part A before it is spread and applied to the vibration-bar. H

When makingthe member A ready for applying to the bar 10, a block or part 15 is inserted in the looped or closed end a of the said member, for spreading the legs a. The loop a constitutes a spring, the tension of which holds the block or spreader 15 in place. Under certain conditions, the loop a and the block 15 are pierced by a slender rod 16,. which extends beyond the loop and its outfi' end supports a ball or weight 17,

which may be solid or hollow according to" the amount of Weight required. The member A is held upon the vibration-bar by means of the zigzag slots 9-9, which are preferably reversed, or formed right andleft. By arranging the'slots 9'9 as illustrated in Figs. 4 and 6, the shoulders 9 prevent the member A from becoming accidentally disengaged from the bar 10. By the use of the zigzag slots, the damping part A may be readily and quickly. applied to, or

removed from the bar 10, and it is not nee-es" sary to employ any other securing means therefor.

- V The rubber member A may be made to different forms, and may be applied to the vibration-bar in various ways, and may or may not have associated with it the pins and balls Iii-and 12?.

By disposing the member A upon the vi bration-bar, the said part being comprised of soft rubber or like 'mbmanm to posite end of the bar. I B

- portions,

.The b noticeable 1n the reproductions damp or lessen the amplitude of the vibrations of saidbar, and also subdues anyvibratory noise which may be the said bar. The length of the member A, as well' as'the spacing of its legs, and also the contact of the legs with'the dilferent portions of the vibration-bar, all tend to restrict the vibrations, and also to subdue noises of said bar to quickly shift the rider A from one position to another, for altering or efi'ectin the different deg gees of modification referred to.

all 1 l contribute to the subduing efiect of the memer A upon the vibration-bar, and their presence or absence can be notice by a quick the noise or harsh sounds from the fundaor subdued and a pleasing tone quality is of the records. The .leg a nearest the elbow 11 of the bar 10, tends to reduce or restrict the lateral vibrations which are greatest at the elbow,

while the leg (I, nearest the rim of the transmittercase tends to steady or dampthe 0py disposing the drawing, the bar vlbrating to a dangerous extent, owing to the near proximity and frequency of the damping parts a. -By increasing the bulk or weight of the member A, as well as, the size or weight of the ball 17, the lateral vibrations of the bar 10 become less and less. And

since it is the lateral vibrations of the bar 10 that chiefly excite the fundamental notes of the bar and related parts, the lesseningof these vibrations prevents the buckling of the diaphragm and the consequent raw or harsh noises of both the vibration-bar and dia phragm, which render the reproductions of e records unfaithful and impure. Y In my former application referred to,'the damping part A was not adjustable lengthwise on the vibration-bar, and hence was incapable of controlling or subduing the lateral vibrations of that portion of the bar between the elbow and The forked member of the present applica produced by and its-supporting'ro'd 16 both proximity of the part having the rim of the casing.

tion is adjustable lengthwise on the bar, and

be disposed in many different positions relatively to the elbow and the rim of the casing, and the legs a may also be adjusted relatively to each other for varying the extent ofthe damping or stabilizing of the vibration-bar. I By constructing and arranging the member A, as herein shown and tone of the instrument is purified by reducing the amplitudeespecially of the lateral vibrations of the bar 10.- The member A beengage spaced portions of the taken with the length or member, its weight and its peculiar grasp of theba'r, tends to steady to cause it to vibrate truer, z. e. eliminate diaphragm. 11 bar, the diaphragm as well less noise,

ball 17 to the member A, still more of the lateral vibrations of the bar 10 are eliminated, which further improves the tone of tion. v

Having thus described my invention, what claim as new and desire to secure by Letters Patents, is

height of the saidv described, the 1 the said bar and part of the lateral vibratlons, but

as recordedis the reproduc- 1. The combination of-the reproducer of l a talking machine, having a diaphragm and a vibratlon-bar, and a damping device comprising a forked elastic part having its legs slotted to receive spaced bar.

'2, The combination of a talking machine having 'a'vibration-bar and a reproducing diaphragm, and a tone modifier a forked elastic part, the legs zigzag interlock wlth the said bar. A

l 3. The combination with a talking machine having a sound reproducing mechanism including a vibration-bar and a diaphragm actuated by said bar,

portions of the said slots toreceive andto 4 of a forked damping device adjustably mounted upon of the said bar, and having zigzag slots to receive and interlock with the said ba tone purifier for talking machines,

comprising mounted upon the brates the-diaphragm, the said noun-conductor a. non -conductor of sounds vibration-bar which viof sounds being bifurcated and its legs havlug slots to receive and grasp spaced portions of said bar.

5. A tone purifier for talking machines, comprising a non-conductor of sounds mounted upon the vibration bar which vibrates the diaphragm, the said non-conductor of sounds being bifurcated. and its' legs justably supported by t having slots to receive spaced poitions of said bar, and a weight carried by said nonconductor of sounds for steadying the same.

6. A tone rectifier forctalking machines.

comprising a forked elastic part adju-stably mounted uponthe vibration-bar which actu- I ates the diaphragm, the said part having the free ends of its legs slottedto receive and grasp said bar. I

7. The combination of the reproducer of a talking machine having a diaphragm and a-vibration bar, the said bar havmg an elbow adjacent the center of the diaphragm, a damping-device slidably mounted on the vibration bar between said elbow and the margin of the diaphragm, and a ball carried by said dampingdevice for steadying the same. .t

8. Atone modifier forqtalking machines, comprising a forked damping member ade vibration bar which vibrates the diaphragm, the legs of the said member spread apart and having slots to receive and interlockthe said bar.

'9. A tone purifier for talking machines,

comprising a forked adhesive member, the

comprising a forked adhesive member, the free ends of the legs of said member being slotted for engaging spaced portions of the vibration bar which actuates the reproducing diaphragm, the said member capable of bem moved lengthwise on the said bar, and a bal mounted on the opposite end of the said member for restricting the vibratory movements of the said bar.

In testimong iwhereof I affix my signature.

' C ARLES P. MARSHALL. 

